A student draws a distance verses time graph to describe the motion of a model train therefore the horizontal section of the graph indicates that the train is moving with uniform velocity with no acceleration because there is no change in velocity.
What is Uniform Velocity?This occurs when the average velocity between any two points along its path is the same in magnitude as well as direction.
If the velocity-time graph for the part of a journey is a horizontal line, then it simply means that the train is moving with uniform velocity with no acceleration because there is no change in velocity thereby making it the correct choice.
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The ______________________of an element is the total number of protons and neutrons in the______________________ of the atom.
Answer:
The atomic mass or mass number of an element is the total number of protons and neutrons in the nucleus of the atom.
Explanation:
done
Answer:
mass number
nucleus of an atom
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What is the total number of valence electrons in a Fluorine atom in the ground state?
The total number of valence electrons in a Fluorine atom in the ground state is 7.
What is ground state in Chemistry?This refers to the energy level the element normally occupies. It is the state of lowest energy for that electron. There is also a maximum energy that each electron can have and still remain a part of its atom.
An atom goes from a ground state to an excited state by taking on energy from its surroundings this process is known as absorption. The electron absorbs the energy and jumps to a higher energy level. In the reverse process, emission, the electron returns to the ground state by releasing the extra energy it absorbed.
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C3H8(g) + 5 O2(g) ---> 3CO2(g) + 4 H2O(g)
What volume of oxygen is required to completely combust 0.452L od propane (C3H8) at STP
Answer: 1.86 L of oxygen is required to completely combust 0.452 L of propane at STP.
Maya made this picture to represent a chemical reaction:
There are two overlapping circles on the left, one white and the other with vertical lines. It is labeled ZX. There is a gray circle labeled Y on the right of ZX. There is a plus sign between ZX and Y. An arrow pointing right is shown on the right of the gray circle labeled Y. Two overlapping circles, one white and the other gray are shown on the right of the arrow and is labeled XY. On the right of XY there is a small circle with vertical lines labeled Z. There is a plus sign between XY and Z.
Which of the following statements best explains the type of chemical reaction represented by Maya's picture? (5 points)
It is neither a synthesis reaction nor a decomposition reaction because the total mass of the products is less than the total mass of the reactants.
It is neither a synthesis reaction nor a decomposition reaction because two reactants form two products.
It represents a synthesis reaction because the same atoms are present in the reactants and products.
It represents a decomposition reaction because two reactants break apart and form two products.
Answer: It represents a synthesis reaction because the same atoms are present in the reactants and products.
Explanation:
The picture shows two reactants ZX and Y are forming a product XY and another reactant XY forming another product Z. The product and the reactants have the same atoms. This is a characteristic of a synthesis reaction, where two or more reactants combine to form a single product.
I hope this helps :)
To solve this we must be knowing each and every concept related to chemical reaction. Therefore, the correct option is option C among all the given options.
What is chemical reaction?A chemical reaction is a process that converts one or more compounds, known as reactants, into one or more distinct substances, known as products.
Chemical elements and compounds are examples of substances. A chemical reaction reconfigures the component atoms of both the reactants to produce various products.
The illustration portrays two reagents ZX and Y generating a product XY as well as another reactant XY producing a product Z. The atoms in the product as well as the reactants are the same. This is a synthesis reaction feature in which two or even more reactants unite to generate a single product.
Therefore, the correct option is option C.
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What is the mass (in kg) of 6.89 x 1025 molecules of CO2? The molar mass of CO2 is 44.01 g/mol. (Show work on scratch paper) 5.04 kg 6.39 kg 3.85 kg 3.03 kg 2.60 kg
The mass of 6.89 x 10²⁵ molecules of CO₂ will be approximately 0.5068 kg.
To find the mass in kilograms of 6.89 x 10²⁵ molecules of CO₂, you can use the formula:
mass (kg) = (number of moles) x (molar mass in g/mol) / (1000 g/kg)
First, convert the number of molecules to moles by dividing by Avogadro's number (6.02 x 10²³mol⁻¹) :
6.89 x 10²⁵ CO₂ molecules / 6.02 x 10²³mol⁻¹ = 11.46 x 10² mol
Then, use the molar mass of CO₂ (44.01 g/mol) to find the mass in grams: 11.46 x 10²mol x 44.01 g/mol = 506.8 x 10² g
Finally, convert the mass in grams to kilograms by dividing by 1000 g/kg: 506.8 x 10² g / 1000 g/kg = 0.5068 kg
So, the mass of 6.89 x 10²⁵molecules of CO₂ is approximately 0.5068 kg.
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in the early 1960s, radioactive strontium-90 was released during atmospheric testing of nuclear weapons and got into the bones of people alive at the time. if the half-life of strontium-90 is 27 years, what fraction of the strontium-90 absorbed in 1962 remained in people's bones in 1990?
The fraction of the strontium-90 that remained in people's bones in 1990 can be determined by using the formula:
N(t) = N0 * (1/2)^(t/T)
Where N(t) is the remaining amount of strontium-90 in people's bones at time t, N0 is the initial amount absorbed in 1962, t is the time elapsed (1990 - 1962 = 28 years), and T is the half-life of strontium-90 (27 years).
So, N(1990) = N0 * (1/2)^(28/27) = N0 * (1/2)^1 = N0 * (1/2) = 0.5 * N0
Therefore, the fraction of strontium-90 that remained in people's bones in 1990 is 1/2 or 0.5.
How can strontium be dangerous to the body?Strontium ium is veritably analogous to calcium and can replace calcium in the bone. This disrupts the normal bone structure, leading to cadaverous problems and blights. babies, children, adolescents, and people who don't get enough calcium are at advanced threat of dangerous health goods related to strontium exposure.
Is stontium highly radioactive?Strontium is a soft, argentine metallic element set up in jewels, soil, dust, coal and oil painting. Strontium set up in nature isn't radioactive and is occasionally called stable strontium.
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If you do a lab that burns Magnesium in pure Oxygen what would the empirical formula of the compound be if you started with 0.6 g Magnesium and 0.4 g of Oxygen?
a. MgO
b. Mg2O2
c. Mg2O3
d. Mg3O2
The empirical formula of the compound is option a.) MgO
The empirical formula of a compound represents the smallest whole number ratio of atoms in a molecule of that compound.
To determine the empirical formula, we need to know the number of moles of each element present in the compound. We can calculate the number of moles by dividing the mass of each element by its molar mass.
Magnesium (Mg) has a molar mass of 24.31 g/mol
Oxygen (O) has a molar mass of 16.00 g/mol
Given that we have 0.6 g of Magnesium and 0.4 g of Oxygen, we can calculate the number of moles of each element as follows:
Magnesium: 0.6 g / 24.31 g/mol = 0.02466 mol
Oxygen: 0.4 g / 16.00 g/mol = 0.025 mol
Now we can find the ratio of atoms of each element in the compound. In order to do that, we divide the number of moles of each element by the smallest number of moles.
Magnesium: 0.02466 mol / 0.02466 mol = 1
Oxygen: 0.025 mol / 0.02466 mol = 1.01
The numbers obtained are not whole numbers, but they are very close to 1, which means the ratio of atoms is close to the ratio of moles, and the empirical formula of the compound is MgO.
Therefore the answer is (a) MgO.
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Calculate Kp for the reaction below. COF2(g)⇌12CO2(g)+12CF4(g) Express your answer using two significant figures.
The Kp of the reaction is 1.5x103.
What does the chemical term "reaction" mean?When atoms establish or break chemical bonds, chemical processes take place. Reactants are the substances that begin a chemical reaction, while products are the compounds that are created as a result of the reaction.
What are fundamental chemical processes?Combination, decomposition, single-replacement, double-replacement, and combustion are the five fundamental types of chemical reactions. You can classify a reaction into one of these groups by looking at the reactants and products.
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What is the difference between the atomic mass of Chlorine and the mass numbers of the individual isotopes? Describe the difference - do not just define the terms.
Answer:
All atoms of chlorine (Cl) have 17 protons, but there are chlorine isotopes with 15 to 23 neutrons
Explanation:
Although all atoms of an element have the same number of protons, individual atoms may have different numbers of neutrons. These differing atoms are called isotopes.
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Click on the Bloomberg Terminal screen to view data in the GLCO function. Which metal had the highest price movement? O AluminumO NickelO IronO Gold
metal speaking, aluminum is a 13-atomic-number chemical with the symbol Al. The density of aluminum is about lower than that of other common metals.
What is the metal response?Hard, lustrous, pliable, fusible, and ductile are all characteristics of metal, a solid material that conducts heat and electricity. The materials that have a propensity to donate electrons are metals. They have an electropositive makeup. Natural substances referred to as non are brittle and metabolically and electrically inert elements in the chemical elements are water, carbon, nitrogen, oxide, phosphorus, arsenic, and selenium.
How is metal created?Components Make Up Metals The atomic components of metals include electrons, neutrons, and protons. The quantity of protons in an atom can be used to identify it from an atom of another element. About 25% of a earth's crust is made up of metals. Metal is any of a group of substances with strong thermal and electrical conductivity, malleability, flexibility, and high light reflection.
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The number of calories needed to raise the temperature of 32 g of water from 12 °C to 54 °C is ___
a. 1.3 cal. b. 1700 cal. c. 0.76 cal.
d. 384 cal
e. 1300 cal
The exact measurement is E. 1300 calories, which is the amount of energy required to raise 32 g of liquid to 12 °C into 54 °C. the range of 12 to 54 °C for 32 g of water.
In 32 gallons of water, how many electrons are there?
Answer and justification We are aware that a substance has 6.022 x 1023 molecules in 1 mole (Avogadro number). Therefore, 10.651023 molecules are present in 32 grams of water. 10.65 10 23 molecular units.
That many calories are required to warm up one gram of water?
hundred calories
The amount of heat required to increase the temperature of one grams (0.001 liters) of fresh water is measured in calories the boiling point of 100 °C.
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The exact measurement is E. 1300 calories, which is the amount of energy required to raise 32 g of liquid to 12 °C into 54 °C.
In 32 gallons of water, how many electrons are there?We are aware that a substance has 6.022 x 1023 molecules in 1 mole (Avogadro number). Therefore, 10.651023 molecules are present in 32 grams of water. 10.65 10 23 molecular units.
That many calories are required to warm up one gram of water?Hundred calories The amount of heat required to increase the temperature of one grams (0.001 liters) of fresh water is measured in calories the boiling point of 100 °C.
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35 ml of a hydrochloric acid solution is titrated with 0.100 m naoh. if it takes 11.22 ml to reach the endpoint of the titration, what was the concentration of the acid solution?
The concentration of the acid solution At the 0 mL =2.79 35 ml of a hydrochloric acid solution is titrated with 0.100 m naoh.
What is the hydrochloric acid used for?Hydrochloric acid (HCl) is commonly used for the neutralization of alkaline agents, as a bleaching agent, in food, textile, metal, and rubber industries. It is neutralized if released into the soil and it rapidly hydrolyzes when exposed to water.
What does hydrochloric acid do to human skin?Skin exposure to low concentrations of hydrogen chloride gas or hydrochloric acid causes erythema and inflammation of the skin whereas high concentrations can cause severe chemical burns to the skin and mucous membranes.
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what are the 4 quantum numbers for the 8th electron in the electron configuration of the ground state of oxygen?
Its four quantum numbers for the eighth oxygen atom electron are n=2, l=1, m=+1 or 1, s=+21 or 21.
What is the oxygen quantum number?chemical attributes.The electronic configuration of the oxygens in its quantum theory ground state is 1s22s22p4.The ground state atoms is in a 3P state, which is an electron-spin sequence of three with a spin number of one (S = 1) and an orbital quantum angular momentum number of one (L = 1).
What are the four quantum orbital numbers?The primary, azimuthal, magnetic, and spin atomic numbers are the four types of quantum numbers.Quantum numbers provide the values of a quantum system's preserved quantities.
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how are atoms in a molecule held together? responses through shared electrons through shared electrons through shared neutrons through shared neutrons through shared energy through shared energy through shared protons
A molecule's atoms are held together by shared electrons. This is known as a covalent bond. In a covalent bond, atoms share one or more electrons in order to fill their outermost electron shell, also known as valence shell.
This forms a stable electron configuration and creates a bond between the atoms. The sharing of electrons creates an electrostatic attraction between the positively charged nucleus of one atom and the negatively charged electrons of another atom. This attraction creates the chemical bond that holds the atoms together in a molecule.A neutron is a subatomic particle that is found in the nucleus of an atom. It has no electric charge and a slightly larger mass than a proton.
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arachidonic acid, released during aea hydrolysis, is not a precursor for the synthesis of what class of molecules?
Arachidonic acid is crucial as a precursor for the manufacture of the eicosanoid signalling molecules, and ethanolamine is included as a polar head in the phospholipid phosphatidylethanolamine.
What are the uses of ethanolamines?
A starting material for the production of surfactants, complexing agents, and even medications, ethanolamine also serves as an agent for soften leather and as a "scrubber" to remove dioxide, hydrogen sulphide, and other acidic contaminants from waste gas streams.
What other name would you give ethanolamine?
To distinguish it from ammonia (DEA) and triethanolamine, ethanolamine is frequently referred to as monoethanolamine or MEA (TEA). It serves as a feedstock for the manufacture of medicines, corrosion inhibitors, polishes, detergents, emulsifiers, and chemical intermediates.
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A tank contains 2.5 moles of gas A, 1.2 moles of gas B and 1.0 moles of gas C. If the total pressure is 0.90 atm, what is the partial pressure of gas B?
Partial pressure of the gas B is 0.23 atm.
What is the partial pressure?Let us note that if there is a mixture of gases that can be found in a particular vessel then we must know that each of the gases that are there would exert its own pressure on the walls of the container.
Now we know that the total number of moles that is present =
2.5 + 1.2 + 1.0 = 4.7 moles. The total pressure of the gases that we have in the system is about 0.9 atm.
We know that;
Partial pressure = Mole fraction * Total pressure
Partial pressure of B is;
1.2/4.7 * 0.9
= 0.23 atm
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Give the product of the reaction of excess benzene with isobutyl chloride + AlCl3. Please draw out the full picture to receive Lifesaver rating
The products formed in the reaction of excess benzene with isobutyl chloride + AlCl₃ is tert-Butylbenzene (major)and Isobutyl benzene (minor). The reaction is attached below.
What exactly are reactants and products?Reactants are the building blocks of chemical reactions, and the substances that are produced are known as the products of a reaction. Chemical reactions can be represented by the standard chemical formula: reaction products. Bonds break and reform during chemical reactions. Additionally, the reaction's opposite result occurs.
During this electrophilic substitution process. Benzene attacks the electrophile created and replaces it with H. The generated electrophile, a primary carbocation, is less stable, as seen in the attached image. This primary carbocation undergoes a proton shift to reorganize into a tertiary carbocation. Consequently, trans-butylbenzene is listed as a major product.
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a piece of copper is heated from 25. c to 36.4 c. it absored 325 joules of heat ernergy in this process. determind the mass of the piece of copper. copper has a speicfic heat of 0.387
A chunk of copper with a mass pf 95.4 g will increase in temperature from 25 °C to 48 °C when exposed to 849 J of heat.
What is the relationship between temperature and heat?This formula explains how a substance's ability to absorb heat and its subsequent change in temperature are related to one another. In your case, you are conscious that a sample of iron weighing 95.4 g heats up from 25 to 48 C after absorbing 849 J of heat.
In what ways do copper & oxygen interact?Copper, much like most metallic elements, only reacts with oxygen from the air. When heated, a layer of black copper oxide forms on it: This experiment could be used as an illustration.
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when would you use a one-color method of applying light cured gels? when would you use a two-color method for applying light cured gels?
A one-color method of applying light cured gels is typically used when only a single layer of gel is needed. For example, if a technician is performing a simple overlay or sculpting nails.
A two-color method for applying light-cured gels is typically used when layering or creating a gradient effect is desired. For example, if a technician is performing a French manicure or creating an ombre effect, a two-color method would be more appropriate. This method allows for more precise control over the application of the gel and can create more intricate designs.
In summary, one-color method is used for simple overlay and sculpting nails, whereas two-color method is used for creating gradient effect, layering and more intricate designs.
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how many types of nonequivalent protons are present in each of the following molecules?
Molecule #1
CH3CH2C=CH
Molecule #2
CH3CH2C(CH3)2CH2CH3
Molecule #3
CH3CH2CH2CH2OCH3
The type of proton in a molecule is referred to as a nuclear magnetic resonance (NMR) active proton. These protons possess a magnetic moment and can be observed in NMR spectroscopy, which is a powerful analytical tool for determining the structure of organic molecules. The chemical shift of the NMR active protons in a molecule depends on their electronic and magnetic environment, which can be used to identify the specific type of proton and the chemical groups it is associated with.
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(7) seven importance of chemistry in our everyday life
Answer:
Knowing chemistry can help you make decisions
Answer:
1 ) chemistry plays a role in the manufacturing of medicines
2 ) chemistry plays a role in the production of cosmetics
3 ) chemistry plays a role in the production of soaps and detergents
4 ) chemistry is used to manufacture construction materials
5 ) chemistry allows us to use fuels
6 ) chemistry is important in agriculture ( providing fertilizers ... )
7 ) chemistry is important in textiles
In order for light to change a material,what must happen?
In order for lights to change material, it needs to interact with electrons, causing electrons to absorb or release energy, thus causing a change in the material. In simple words, refraction is needed
Which of the property of base is incorrect?(A) Soapy to touch(B) Good conductors of electricity(C) Liberates heat on dilution(D) All of above
The property of base is soapy to touch. It is good conductors of electricity. It also liberates heat on dilution. So, all the given statements are correct.
We can identify physical as well as chemical properties of bases. Physical properties are those that can be identified by our sense organs. We can touch, see, smell, or feel these physical properties and identify them. The physical properties of bases are: they are bitter in taste; they are soapy or slippery to touch; and they turn red litmus blue.
Meanwhile, the chemical properties of the bases are: they react with acids to form salt and water; they react with metal and liberate hydrogen gas; some conduct electricity but only in aqueous state; they are not very good conductors in solid state; they produce hydroxide ions in solution; and they liberate ions and heat on dilution.
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What is the empirical formula of the compound: C5H5N5?
Select one:
a.C5H5N5
b.C2H2N2
c.CHN
Answer:
The correct answer is a. C5H5N5
Explanation:
The empirical formula of a compound is the simplest whole number ratio of the atoms of each element in the compound. In this case, the empirical formula of the compound C5H5N5 is C5H5N5, which is the simplest whole number ratio of the atoms of carbon, hydrogen, and nitrogen in the compound.
when you see two consecutive carbon atoms in a protein backbone structure how would you determine which one is the alpha carbon? provide at least two
1. Look for neighboring atoms and determine which carbon is connected to a hydrogen atom. The carbon connected to the hydrogen atom is the alpha carbon.
What is atom?Atom is an open-source, cross-platform code editor developed by GitHub. It is a hackable text editor for the 21st century, built on Electron, and based on everything developers love about Sublime Text, Visual Studio Code, and more. Atom is designed to be a tool for developers, with many features and packages for customizing the interface, editing code, and debugging code. It is also designed to be customizable and extensible, allowing developers to create their own packages and themes for Atom, as well as use existing packages and themes from the community.
2. Look for the presence of a nitrogen atom in the neighboring atoms. The carbon atom connected to the nitrogen is usually the alpha carbon.
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Choose the correct chemical structure of a dinucleotide composed of AA and GG and the dinucleotide composed of TT and CC in an antiparallel fashion to the previous structure. Take into account the possible hydrogen bonds.
Figure (1) is erroneous because adenine (A) is triple hydrogen bonded to thymine (T), whereas guanine (G) and cytosine (C) are double hydrogen bonds. Figure (2) is valid since both base pairs are arranged correctly.
In nucleic acids, purine bases form hydrogen bonds with pyrimidine bases in a precise way known as base pairing. Adenine forms double hydrogen bonds with thymine. Cytosine forms triple hydrogen bonds with guanine. A dinucleotide is now a nucleotide compound made up of two nucleotides. As a result, each nucleotide unit is made up with one nucleobase, one pentose moiety, as well as phosphoric acid. Nucleotides are organic compounds made up of a nucleoside as well as a phosphate.
They function as monomeric units of a nucleic acid polymers deoxyribonucleic acid (DNA) & ribonucleic acid (RNA), both of which are crucial macromolecules for all life on Earth. Nucleotides are received from meals and are also produced by the liver from common components. Nucleotides are made up of three component molecules: a nucleobase, a sugar with five carbons (ribose or deoxyribose), and just a phosphate group with one to three phosphates. Nucleotides also play an important role in metabolism at the cellular level.
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calculate the frequency of the n = 6 line in the lyman series of hydrogen.
In what region of the electromagnetic spectrum is this line observed?
- radio
- X-ray
- visible
- gamma
- infrared
- ultraviolet
- microwave
The Lyman series is a hydrogen spectral series of transitions and resulting ultraviolet emission lines when an electron moves from n=6 to n = 1 with a frequency of 1.066nm.
Given the electrons are de-excited from n2 = 6 to n1 = 1
From the formula we can observe that, 1/∧ = RZ^2(1/n1^2 - 1/n2^2)
where R is Rydberg’s constant = 109677 cm-1 and Z is atomic number.
Since it is hydrogen atom its atomic number = 1
We know that frequency(f) = c/∧ where 1/∧ = f/c
So, f/c = RZ^2(1/n1^2 - 1/n2^2) where c is speed of
f = 109677 x 10^2 x 1 x (1 - 1/36)
f = 10663041.6 = 1.066nm.
Hence the frequency of the n = 6 line in the lyman series of hydrogen is 1.066nm.
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The mass ratio of sodium to fluorine in sodium fluoride is 1. 21:1. A sample of sodium fluorideproduces 28. 8 g of sodium upon decomposition. How much fluorine (in grams) forms?
The premise behind this problem is that if the thermal decomposition also yields 34.5 g of sodium, you must utilise the stated mass ratio to calculate how much fluoride will be produced.
What the body does with sodium?
Sodium is a vital component that the body needs in very tiny amounts to keep bodily fluids in balance, keep nerves and muscles functioning properly, and to prevent excessive perspiration. The majority of Americans consume too much of it, and they might not even be aware of it.
What are sodium's five uses?
5Uses. Titanium, sodamide, sodium cyanide, sodium peroxide, & sodium hydride are all made from sodium. Nuclear reactors have used liquid sodium as a coolant in the past. Streetlights use sodium vapour, which emits a dazzling yellow light.
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What is the pH of a 3.4x10-8 M HClO4 solution at room temperature?A.7.1B.7.0C.5.3D.6.9
7.4 is the pH of a 3.4x10-8 M HClO4 solution at room temperature.
What is pH?PH is an abbreviation for potential of Hydrogen or the acidity or alkalinity of a substance. It is a measure of the hydrogen ion concentration in a solution, and is expressed on a scale from 0 to 14, with 7 being neutral. Solutions with a PH below 7 are considered acidic, and those with a PH above 7 are considered alkaline. PH can be used to measure the acidity or alkalinity of water, soil, chemicals, foods, and other substances. PH is an important factor in many aspects of biology and chemistry, and plays a significant role in understanding and controlling the environment.
pH = - log (H+)
=> -log (3.4x10-8 M)
=> 7.4
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What particles does the nucleus of a copper isotope, Cu-62 contain?
There are 29 protons and 33 neutrons in the nucleus of Cu-62.
What are isotopes?
Let us remind ourselves that the number of neutrons that is contained by different atoms of the same element is not the same. Hence, atoms of the same element would have atoms that have the same atomic number but do not have the same number and we call these different atoms the isotopes of the element.
We know that there are different isotopes of copper and they differ in the number of the particles that can be found in the nucleus of each of the isotopes that we have in the compound.
In this case, we have an isotope has been identified as Cu-62. We know that the atomic number of copper is 29 hence there are 29 protons in the nucleus an the number of the neutrons would then be 62 - 29 = 33 neutrons.
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